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In «The Comatulæ of the Willem Barents Expeditions», 

 1880—84 (Bijdr. tot de Dierk. 13. Afl. 1886) P.H.Carpenter 

 describes a new species, Ä. Barentsi, remarkable through «the 

 extensive development of anambulacral plates in the perisome 

 of the genital pinnules. In this respect it differs from all the 

 Comatulæ of the arctic and temperate regions». — From the 

 informations given above it is clear thai Л. Barentsi in this respect 

 closely agrees with A.Eschrichti — and this is the main charac- 

 ter of the species. The only other character of some impor- 

 tance is the length of the cirri, which is said not to reach 

 20mm. Now there are on the figure given by Carpenter of 

 the single specimen found only three unbroken cirri represen- 

 ted, and the longest of these is с 25 mm. Carpenter further 

 points out that the third pinnule is much shorter than the 

 second; in this respect, however, much variation is found 

 there being great differences not only between the individuals 

 but between the different arms of the same specimen and even 

 between the two sides of the same arm. From what here is 

 said, I think, we may safely regard A. Barentsi as synonymous 

 with A. Eschrichti. 



A.prolixa. The joints are rather long and slender; a thin 

 keel is found on the interior side, but the outer 4 — 5 joints 

 are quite cylindrical without such a keel. The outer side of 

 the joints is smooth, only at the upper end of all the joints 

 there is a circlet of thorns. (PI. I. Fig. 1 — 3). The covering- 

 plates are long, narrow, curved rods, at the outer end a little 

 widened and with a few holes; the lower part is beautifully bent, 

 parallel to the joint. (PI. I. Fig. 3). As in A. Eschrichti sacculi 

 and covering-plates alternate regularly. In the genital pinnules 

 no secondary plates are developed in the skin of the widened 

 part, it remains quite naked. The ambulacral groove is not 

 found on the 3 — 4 last joints. (PI. 1. Fig. 2.) It may yet be 

 noted that the covering-plates are sometimes a little irregular 

 in the lover part, they may even be a httle fenestrated. 



